Re: (not?) using preservingMatrix

>
> Right, I buy that.  But I don't see how the C line
>
> glGetFloatv (GL_MODELVIEW_MATRIX, your_matrix_result) ;
>
> can be done, since it writes a result into your_matrix_result, so I would
> need something like:
>
> preservingMatrix $ do
>     loadIdentity
>     -- do whatever you want with your your matrix
>     rs <- get ((matrix $ Just $ Modelview 0)::StateVar(GLmatrix GLdouble))